Production of hollow bodies by centrifugal casting



1. 1928. 1 1,668,318 I C. HUMPERDINCK PRODUCTION OF HOLLOW BODIES. BYCENTRIFUGAL CASTING Filed Nov. 10. 1926 Patented May 1, 1928.

UNITED STATES CARL HUMPERDINCK, OF WETZLAR-LAHN, GERMANY.

PRODUCTION OF HOLLOW BODIES BY CENTRIFUGAL CASTING.

Application filed November 10, 1926, Serial No. 147,498, and in GermanyNovember 10, 1925.

In order to convey metal in molten state from casting ladies lnto theinterior of rotating centrifugal casting moulds, different forms ofcasting channels or casting tubes 6 have been used which are eitherrotatable or stationary. The disadvantages of casting channels reside inthe loss of heat incurred by the molten metal in its long path throughthem, the metal becomes oxidized and in- 110 crustations form on theWalls of the casting channels and casting tubes and on the surfaces ofthe molten metal.

Casting channels or casting tubes in which the cross sectional area offlow is about onehalf or two-thirds filled, in consequence of theintense heating on one side become distorted, so that an increasedcasting operation is hardly possible. With such rapidly ro-'.

tating casting tubes, on account of the unilateral application of theweight by bent tubes or by weight of the fluid metal, bending andconsequent shaking of the casting tubes occurs.

The above-mentioned disadvantages of known casting tubes are avoided inaccordance with the present invention by imparting to them during thepassage of the molten metal therethrough a transverse swinging movementof continuously changing direction.

Devices suitable for performance of this method are illustrated by wayof example in the accompanying drawing in which:

Fig. 1 is a longitudinal section through the casting device,

Fig. 2 is an end View of one form of the metal receiving head, whileFig. 3 is a. corresponding view of anothe form of the receiving head.

Molten metal is poured from the casting ladle A into the hopper B. Fromthis stationary hopper the metal flows into the receiving head Cconnected with the casting tube D and thence through the casting tubeinto the interiorof the centrifugal casting mould E. The casting tube Dis rotatably mounted in a standard F. When the molten metal is deliveredto the centrifugal casting mould E the machine is caused to travel adistance corresponding to the length of the pipe to be formed. While themolten metal is passing from the hopper B into the receiving head 0 andthrough the casting tube.

D, the casting tube with its receiving head is given an oscillatingmotion by means of a lever H secured thereto, Fig. 2.

'As a result the metal within the casting tube moves around the wallsthereof and washes off any projection which would induce the formationof incrustation. Moreover, non-uniform heat transmission through thecovering of the casting tubes is avoideda matter of great importance inview of the distortion of the casting tube.

In lieu of fitting the casting tube with a hand lever it may be providedwith a toothed segment meshing with a pinion ll-I adapted to be rotatedalternately in opposite directions, providing for effecting mechanicallythe swinging movement of the casting tube.

1. The method of producinghollow bodies.- such as tubes, by centrifugalcasting, which includes imparting to the casting tube during the passageof the molten metal lengthwise thereof a transverse vibratory movementof alternately varying direction.

2. In apparatus for the production of hollow'bodies by centrifugalrotatable casting, including a casting mould and an open ended castingtube, means located externally of the casting mould for imparting to thecasting tube an oscillatory movement about its longitudinal axis.

3. In a rotary casting machine, the combination of a rotary mould, ametal delivery tube disposed therein and having an open end for thedelivery of the molten metal, saidmould and said tube being relativelymovable longitudinally during the delivery of the metal to distributethe metal lengthwise of the mould, and means for imparting to said tubean oscillating movement about its longitudinal axis during saidlongitudinal movement.

4. A rotary'casting machine, including a rotary mould mounted forlongitudinal movement, a casting tube projecting into the mould andhaving an open end, and means for oscillating the tube about itslongitudinal axis.

5. A rotary casting machine having a stationary hopper, a metal deliverytube dis posed substantially horizontal and having an open end,.meansfor oscillating said tube about its longitudinal axis,and meansconnected to said tube for delivering metal thereto from said hopperduring said oscillatory movement.

6. In a rotary casting machine, a metal delivery tube having an openend, and means for oscillating the tube back and forth during 'the flowof metal therethrough, said tube having means permitting the delivery ofmetal thereto during said oscillating movement.

7. The method of forming hollow cast bodies which includes rapidlyrotating the mould, delivering metal thereto from an

